Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46e720db98798f4773480def15c3d4b29d77fbd39069bf8217bb1e59e2b2ca92' 
  AND token = 'nQ9B0hfYMDwOdpjWZ5dWPMkoB4y1MyjI182sJ9oYO/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}